Primary electric cell



NOV. 24, 1936. D DOMlZl PRIMARY ELECTRIC CELL Filed Dec. 22, 1932INVENTOR a m/0 DOM/Z/ ATTORN EY Patented Nov. 24,1936 2,061,899

UNITED STATES PATENT OFFICE PRIMARY ELECTRIC CELL Dario Domizi,Lakewood, Ohio, assignor, by mesne assignments, to Union Carbide andCarbon Corporation, a corporation of New York Application December 22,1932, Serial No. 648,334 3 Claims. (01. 136-1825 This invention relatesto primary electric cells pletely covered by electrolyte at all times,and having liquid electrolyte and more specifically to since the batteryshould not be so full of liquid means for indicating the proper heightfor the that there is danger of spillage or overflow, it is liquidelectrolyte in such cells. desirable to provide means whereby thecorrect This and any other objects of my invention will level of theelectrolyte may be indicated. 5 be evident from the followingspecification and As an example of such means I provide opposed theaccompanying illustration, in which the single recesses such as 52 inopposite inner walls of a figure is a perspective view of a battery witha casing H to support a horizontal wire or rod 53 portion broken away toshow the structure of a of cylindrical metal or other suitable materialcell embodying my invention. directly below or adjacent and visiblethrough In This application is a continuationin part of the fillingopening, such as that shown at 42, my application Serial No. 508,788,filed January with the bottom thereof at the correct level for 14, 1931.i I the electrolyte. Cell cover 3| closes the tops of In cells of thetype described herein it has been recesses 52 and secures the indicator53 rigidly found advantageous to cast a block of electrolyte therein.

forming material, such as the monohydrate of Iclaimzcaustic soda, aboutthe electrodes. This forms a 1. In a primary cell having liquidelectrolyte protection for the electrodes during shipment and and afilling opening; a liquid level indicator has numerous other advantages.This material comprising a horizontal rod below said opening, takes upwater very readily and it is desirable said rod extending between andbeing supported that the battery should be sealed during shipby oppositesides of said cell and being visible ment. At the same time it isdesirable that through said opening. the seal should be easily broken topermit the 2. In a primary cell having liquid electrolyte addition ofwater which dissolves the electrolyte and afilling opening; a liquidlevel indicator comforming material. To secure the desired resultprising a horizontal metal wire rigidly secured I provide a fillingOpening 42 On Which s Secured below said opening and extending acrosssaid a cap 43; this cap having an opening 44 to peropening substantiallydiametrically at the proper mit the venting of the cell during use.While level f r said electrolyte Imay use a dummy cap without thisopening dur- 3. In a primary cell having a casing, liquid mg Shipment. Ihave folind sa'Plsfaptory proce' electrolyte in said casing, a cover forsaid casing, t to cot-151st of formmg haphrigm and a filling opening insaid cover; a liquid level integral with the top. This diaphragm isrelat h rizontal rod below Said. tively thin and can easily be brokenaway when m compnsmg 0 it is desired to fill the cell for use. This dia-PPemng, means e n i mg opposed recesses in sa1d casmg, each prophragm',being of the same material as the cell cover, is inert and the piecesmay be all t vided with an open top, in wh ch sa d indicator isdisposed; and means comprising sa1d cover for fall into the cell. Theelectrolyte-forming material dissolves without evolution of great heat se the op f eachtof d recesses and s as would be-the case if anhydrouscaustic were ing Said indlpcator thereinused. Since the zinc electrodesshould be com- DARIO DOMIZI'

